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EQUITY-BASED COMPENSATION - Performance share units (Details) - Performance share units $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) item	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of times shares issued for each performance share settlement | item			1
Grant date fair value of PSUs			$ 6.9		$ 5.9
Compensation expense	$ 0.8	$ 0.4	1.7	$ 0.6
Fair value of outstanding shares			11.8
Unrecognized compensation expense	$ 8.6		$ 8.6
Weighted-average remaining life			1 year 9 months 18 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of times shares issued for each performance share settlement | item			0
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of times shares issued for each performance share settlement | item			1.75
Return on assets Less than 9.6%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target PSUs Earned			0.00%
Return on assets 9.6%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target PSUs Earned			50.00%
Return on assets 12%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target PSUs Earned			100.00%
Return on assets 14.4%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target PSUs Earned			175.00%

X

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The percentage of targeted performance share units earned.

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